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The effect of Si addition on the microstructure and shape recovery of FeMnSiCrNi shape memory alloys has been studied. The microstructure of these alloys remains single-phase austenite (γ) up to 6% Si addition and beyond that it becomes two-phase γ+δ-ferrite. The Fe5Ni3Si2 type intermetallic phase starts appearing into the microstructure after 7% Si and makes these alloys brittle. The amount of shape recovery increases monotonically till 6% Si addition and is proportional to the amount of stress induced ε martensite. Alloys containing >6% and <4% Si show poor recovery due to formation of δ-ferrite and stress induced α’ martensite respectively. Si addition decreases the stacking fault energy (SFE) of the γ phase and resulted in easier nucleation of stress induced ε martensite. The amount of athermal ε martensite decreases with increase in Si

Role of Si in improving the shape recovery of FeMnSiCrNi shape memory alloys